The damage can, however, be undone. If you have a Mac, you can simply reply to the offending text message in iMessage with any other string of text to stop it from crashing your iPhone. If you don’t have a Mac, you can try sending a text message from a third-party app using its ‘share’ function, ask Siri to send a reply, or beg the sender to send a follow-up text. If you know who the sender is.

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“We are aware of an iMessage issue caused by a specific series of unicode characters and we will make a fix available in a software update,” an Apple spokesperson said via email.

We’ll update this post when Apple issues a fix. Until then, that simple line of text could cause some serious headaches.